Move new_relic_rpm gem into development group
Move new_relic_rpm gem into development group

hotvulcan/whitehall,askl56/whitehall,robinwhittleton/whitehall,robinwhittleton/whitehall,hotvulcan/whitehall,alphagov/whitehall,askl56/whitehall,ggoral/whitehall,ggoral/whitehall,hotvulcan/whitehall,alphagov/whitehall,ggoral/whitehall,YOTOV-LIMITED/whitehall,hotvulcan/whitehall,ggoral/whitehall,robinwhittleton/whitehall,askl56/whitehall,YOTOV-LIMITED/whitehall,YOTOV-LIMITED/whitehall,YOTOV-LIMITED/whitehall,robinwhittleton/whitehall,alphagov/whitehall,askl56/whitehall,alphagov/whitehall